Question: What is {Human Development Index} of {Bulgaria} that is {point in time} in {1980-0-0} ?
Paraphrase: In 1980, what was the HDI for Bulgaria?
SPARQL (Wikidata): SELECT ?obj WHERE { wd:Q219 p:P1081 ?s . ?s ps:P1081 ?obj . ?s pq:P585 ?x filter(contains(YEAR(?x),'1980')) }